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Map Legend
Region Name Number of Studies
World [map] 154
North America 132
United States 128 [studies]
Alabama 12 [studies]
Arizona 18 [studies]
Arkansas 3 [studies]
California 21 [studies]
Colorado 7 [studies]
Connecticut 7 [studies]
District of Columbia 2 [studies]
Florida 14 [studies]
Georgia 10 [studies]
Idaho 3 [studies]
Illinois 14 [studies]
Indiana 9 [studies]
Iowa 4 [studies]
Kansas 7 [studies]
Kentucky 6 [studies]
Louisiana 6 [studies]
Maryland 12 [studies]
Massachusetts 13 [studies]
Michigan 9 [studies]
Minnesota 4 [studies]
Mississippi 7 [studies]
Missouri 14 [studies]
Montana 4 [studies]
Nebraska 7 [studies]
Nevada 6 [studies]
New Hampshire 1 [studies]
New Jersey 6 [studies]
New York 25 [studies]
North Carolina 11 [studies]
North Dakota 1 [studies]
Ohio 14 [studies]
Oklahoma 7 [studies]
Oregon 5 [studies]
Pennsylvania 11 [studies]
Rhode Island 2 [studies]
South Carolina 9 [studies]
South Dakota 2 [studies]
Tennessee 8 [studies]
Texas 31 [studies]
Utah 14 [studies]
Virginia 10 [studies]
Washington 6 [studies]
Wisconsin 2 [studies]

Click on a [map] link to show a map of that region.

Click on a [studies] link to search within your current results for studies in that region. Use the back button to return to this list and try another region.

Studies with no locations are not included in the counts or on the map.

Studies with multiple locations are included in each region containing locations.